Piano string-plate.



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UNITED STATES PATENT OFFICE.

CLIFFORD ROBERT STEPHEN JOI-IN HALLE, OF LONDON, ENGLAND.

PIANO STRING-PLATE.

SPECIFICATION forming part of Letters Patent No. 682,067, dated September 3, 1901.

Application filed March 5 1901.

To a/ZZ wiz/om, t may concern:

.. Be it known'that I, CLIFFORD ROBERT STE- 'PHEN JOHN HALL, a subject of the King of Great Britain, residing at 50 Lincolns Inn Fields, London, England, have invented certain new and useful Improvements in Means of Attaching and Firmly Securing Bent Side Plates to the Iron Frames of Pianofortes, of which the following is a specification.

The object of my invention is an improved mode or means of attaching bent side plates or hitch-pin plates to iron frames of pianofortes by bolts and bearing pieces or blocks in such manner that said plates are held firmly and immovably secure to withstand the strain of the strings under tension.

My invention will be understood by the following description, aided by the accompanying drawings, in which- Figure 1 is a part side sectional elevation of a portion of a frame-bar, showing a hitchpin plate bolted thereto. Fig. :Z is a part side sectional elevation of a portion of a framebar to the raised portion of which a hitch-pin plate is bolted, the raised portion being provided with a shoulder against which the hitchpin plate abuts. Fig. 3 is a part side sectional elevation of a portion of a frame-bar to the raised portion of which a hitch-pin plate is bolted, the raised portion being provided with a shoulder against which a thicker' portion on the under side of the hitch-pin plate abuts. Fig. 4 is a front elevation of a complete frame with the hitch-pin plate in position.

For the purpose of my invention as applied to iron frames in which vertical bars A of T- section are employed I east said bars with raised portions or bearing pieces B, upon which the bent side or hitch-pin plate C is laid, each bearing-piece B being formed on the bar A in the respective vertical position it should occupy with regard to the curvature or shape of the bent side plate O, from near the bottom of the frame at one side toward the top at the other side, as at Fig. 4. The bent side or hitch-pin plate C is rmly clamped or secured to those raised bearing-pieces B by bolts D,passed through holes drilled or formed inthe plate C and through each bearing-piece Serial No. 49,861. (No model.)

B, the bolts D being tightened up by nuts E, preferably at the back.

In some cases, as at Fig. 2, I cast shoulders or abutments F on the raised bearing-pieces B for one edge of the bent side plates O to abut against, in which oase the bolts D would be relieved of the strain of the strings, which would be borne by the abutments F and would serve only to clamp the plate C to the bearingpieces B.

In the two examples, as at Figs. l and 2, just described, the bent side plate C is preferably formed of a plain plate of steel; but it may be of cast-iron,of two or more thicknesses, the shoulder G of a thicker portion H on the under side of the plate C abutting against wide abutinents F on the raised bearing-piece B on the T-bars of the frame, the thinner portion projecting over and covering the abutments F. By this latter construction I am enabled to make use ot cast-iron for the bent side plate without necessitating the employment of a heavy plate of one thickness all through.

I represents the hitch-pins or lugs.

lVhat I claim, and desire to secure by Letters Patent., is-

1. In a piano, the combination with the piano-frame, of projections formed on the bars of said frame and each provided with a shoulder, a hitch-pin plate mounted against said projections and having one edge thereof abutting against said shoulders, and means for securing said plate to the said projections.

2. In a piano, the combination with the frame thereof, of projections formed on the bars of the said frame, a hitch pin plate mounted against said projections, and means extending through the plate and projections for securing the plate to the frame'.

3. In a piano, the combination with the frame thereof, of a series of projections formed integral with the bars of the frame, and each provided with a shoulder, a hitchpin plate having its underside formed with a thickened portion abutting against the shoulder of the projections, and means for securing the plate to the frame.

11. In a piano, the combination with the frame thereof, of a series of projections IOC formed integral with the bars of the frame and In testimony whereof have hereunto set each provided with a shoulder, a vhitch-pin my hand in presence of two subscribing wit= plate having lits under side formed with a nesses.

thickened portion abutting against the shoul- CLIFFORD ROBERT STEPHEN JOHN HALLE; 5 der 'of the projections, and bolts extending Witnesses: .E

through the said plate and projections for se- WM. O. BROWN,

curing the plate to the frame. IREEO FRANCO. VALHQl 

